Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 42, Pages 16708-16713Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp805403e
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To realize high-safety, high-performance lithium ion secondary batteries using room-temperature ionic liquids, we examined [graphite electrodelroom-temperature ionic liquid-lithium salt binary electrolytellithium metal electrode] cells by varying the cation structure of the room-temperature ionic liquid. In particular, a bis(fluorosulfonyl)imide anion based room-temperature ionic liquid cell showed high charge/discharge capacity and reversibility. By application of electrochemical calorimetric measurements during charge/discharge operation, the formation of a suitable interfacial layer, such as a solid electrolyte interphase between the graphite electrode and the room-temperature ionic liquid-lithium salt binary electrolyte was indicated. Moreover, we found that not only the anion structure but also the cation structure was important for the suitable charge/discharge of the graphite electrode.
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